Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55402

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55287

When the path contains a mountpoint on Unix or a junction point to
another drive on Windows, cmd.exe should show free space for the
path instead of the root of the drive.

Found with Coccinelle.

Several items here were encoded conditionally even though they aren't marked
as optional in the spec.
Signed-off-by: Torge Matthies <openglfreak@googlemail.com>

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55286

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54718

(when CREATE_NEW_CONSOLE is used).
Signed-off-by: Eric Pouech <epouech@codeweavers.com>

Signed-off-by: Eric Pouech <epouech@codeweavers.com>

We were using bit 1 of RTL_USER_PROCESS_PARAMETERS for two different cases:
- rightfully, as a sign to block ctrl-c events from being processed by
  handlers (and by default, terminating the process)
- But this was also used to request for the creation of a new process group.

This patch properly separates the two use cases, by using the
ProcessGroupId field in RTL_USER_PROCESS_PARAMETERS (checked that Win10
behaves as this patch in RtlCreateUserProcess wrt.
RTL_USER_PROCESS_PARAMETERS ProcessGroupId usage input/output).

Introduce process_group_id in startup_info_t and use it to pass it to
server. ProcessGroupId field in RTL_USER_PROCESS_PARAMETERS is now properly
set.

Note: this will change some external behavior.
- before this patch, a child process created with Ctrl-C disabled
  (ConsoleFlags set), couldn't turn it on as the process was detached
  from unix console.
- now, SIGINT handling is moved to kernelbase (and can be turned on/off at
  application will),
- when creating a new windows group id, the child will be detached from
  unix console, so will no longer receives the SIGINT from ctrl-c in unix
  console (if parent was attached to this unix console).
Signed-off-by: Eric Pouech <epouech@codeweavers.com>

Signed-off-by: Eric Pouech <epouech@codeweavers.com>

Signed-off-by: Eric Pouech <epouech@codeweavers.com>